Subject: BFSC
From: ACRE NL
Date: 1/21/2002, 12:37 AM

I took some data on the EGT CHT of my brand new engine.

8500 Feet. 18 inches Hg manifold pressure. 2280 optical tach RPM
(mechanical tach said 2400). OAT 36 F. Cowl flaps closed. Leaned rich of peak.
155 MPH TAS. This is a carb engine with very unequal length intake runners
indeed. The carb is on the back end of the engine feeding into
two constant diameter logs running down each side of the engine 
with branches into each cylinder. Note the EGT and CHT do not track.

Cyl  EGT  CHT 
1    610  126
2    591  121
3    609  125
4    534  120
5    554  114
6    580  96

The baffles are in pretty good shape but could be better.
I intend doing a bit of work on them to try and equalize
the CHT a bit closer. Particularly number six which seems
to consistently run cool. I will swap thermocouples
to be certain it is not a bad thermocouple.

Temps are in Centigrade so see the conversion chart below
for the aircraft standard  Fahrenheit.

Klause and I discussed GAMI. His opinion of them matched mine for a
change :-)>   

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org

CENT2FA2.DAT
C   80   82   84   86   88   90   92   94   96   98  100
F  176  180  183  187  190  194  198  201  205  208  212

C  100  102  104  106  108  110  112  114  116  118  120
F  212  216  219  223  226  230  234  237  241  244  248

C  120  122  124  126  128  130  132  134  136  138  140
F  248  252  255  259  262  266  270  273  277  280  284

C  140  142  144  146  148  150  152  154  156  158  160
F  284  288  291  295  298  302  306  309  313  316  320

C  160  162  164  166  168  170  172  174  176  178  180
F  320  324  327  331  334  338  342  345  349  352  356

CENT2FAR.DAT
C  500  502  504  506  508  510  512  514  516  518  520  522  524
F  932  936  939  943  946  950  954  957  961  964  968  972  975

C  525  527  529  531  533  535  537  539  541  543  545  547  549
F  932  936  939  943  946  950  954  957  961  964  968  972  975

C  550  552  554  556  558  560  562  564  566  568  570  572  574
F 1022 1026 1029 1033 1036 1040 1044 1047 1051 1054 1058 1062 1065

C  575  577  579  581  583  585  587  589  591  593  595  597  599
F 1067 1071 1074 1078 1081 1085 1089 1092 1096 1099 1103 1107 1110

C  600  602  604  606  608  610  612  614  616  618  620  622  624
F 1112 1116 1119 1123 1126 1130 1134 1137 1141 1144 1148 1152 1155

C  625  627  629  631  633  635  637  639  641  643  645  647  649
F 1112 1116 1119 1123 1126 1130 1134 1137 1141 1144 1148 1152 1155

C  650  652  654  656  658  660  662  664  666  668  670  672  674
F 1202 1206 1209 1213 1216 1220 1224 1227 1231 1234 1238 1242 1245

C  675  677  679  681  683  685  687  689  691  693  695  697  699
F 1247 1251 1254 1258 1261 1265 1269 1272 1276 1279 1283 1287 1290

C  700  702  704  706  708  710  712  714  716  718  720  722  724
F 1292 1296 1299 1303 1306 1310 1314 1317 1321 1324 1328 1332 1335

C  725  727  729  731  733  735  737  739  741  743  745  747  749
F 1337 1341 1344 1348 1351 1355 1359 1362 1366 1369 1373 1377 1380